I began my flute playing two years ago with an old instrument and a tutor book. I postponed getting a teacher because I know how to read music and honestly thought I didn't need one. The next step was to buy a new flute in the hope that this would help solve all the problems that were appearing.
Wrong! I managed to learn the first five or six notes OK, and got quite excited at the little tunes I was able to play. But middle register notes would not come. I also then worried about developing bad habits in my playing, and so found myself a teacher who only teaches flute and music theory (and fife to little ones). Progress was immediate, and she not only corrected embouchure and posture, but helped me with breathing, articulation and phrasing.
So, yes, get yourself a good teacher right away

. Mine lent me a book which I found helpful as a supplement to her teaching - The Gilbert Legacy, by A S Floyd. Lots of tips, photographs and examples.